If you want to see how to write your own spreadsheet modules, you can download a free copy of Excelsior 1.3 for Windows from this zip file. To install it, unzip the file into a clean directory. You then need to follow the installation instructions in our Excelsior installation and user guide. So that you know exactly what installation is doing to your computer and Registry, we haven't provided an automatic installer. However, the installation process described in our guide is simple and takes only a minute or two.
The guide also describes how to run Excelsior, and explains the Excelsior language.